Vulnerability Details : CVE-2017-8923
Potential exploit
The zend_string_extend function in Zend/zend_string.h in PHP through 7.1.5 does not prevent changes to string objects that result in a negative length, which allows remote attackers to cause a denial of service (application crash) or possibly have unspecified other impact by leveraging a script's use of .= with a long string.
Vulnerability category: Denial of service
Products affected by CVE-2017-8923
- cpe:2.3:a:php:php:*:*:*:*:*:*:*:*
- cpe:2.3:a:php:php:*:*:*:*:*:*:*:*
Threat overview for CVE-2017-8923
Top countries where our scanners detected CVE-2017-8923
Top open port discovered on systems with this issue
80
IPs affected by CVE-2017-8923 1,107,287
Threat actors abusing to this issue?
Yes
Find out if you* are
affected by CVE-2017-8923!
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attack surface intelligence
from SecurityScorecard.
Exploit prediction scoring system (EPSS) score for CVE-2017-8923
0.52%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 77 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2017-8923
Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
---|---|---|---|---|---|---|
7.5
|
HIGH | AV:N/AC:L/Au:N/C:P/I:P/A:P |
10.0
|
6.4
|
NIST | |
9.8
|
CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
3.9
|
5.9
|
NIST |
CWE ids for CVE-2017-8923
-
The product writes data past the end, or before the beginning, of the intended buffer.Assigned by: nvd@nist.gov (Primary)
References for CVE-2017-8923
-
https://security.netapp.com/advisory/ntap-20241227-0007/
-
http://www.securityfocus.com/bid/98518
PHP 'zend_string_extend()' Function Denial of Service VulnerabilityThird Party Advisory;VDB Entry
-
https://bugs.php.net/bug.php?id=74577
PHP :: Bug #74577 :: Memory corruption in zend_string_extendExploit;Issue Tracking;Vendor Advisory
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